(Dan Peled/AAP PHOTOS)The opposition wants a big cut to migration, to meet the rate of new housing supply being built. (Dan Peled/AAP PHOTOS) Credit: AAPA senior coalition frontbencher has refused to confirm specifics of his party's plan to cut migration numbers, despite a formal announcement expected to be made. Treasury modelling published in the May budget expects net overseas migration to fall from 301,000 to 225,000 by the end of the decade. Senator Bragg will advocate for an average annual net overseas migration rate of 180,000 to make up for a shortfall of housing. "Lifting migration standards, and analysing them carefully each year, is crucial to ensure integrity and public trust in our migration settings," he will say.